Optical transmission module

Abstract

An optical transmission module includes: a main substrate having a front surface and a back surface; an optical connector having a connector substrate; a first transparent substrate disposed between the connector substrate and the main substrate; a heat source element disposed between the connector substrate and the back surface of the main substrate, and electrically connected to the main substrate; one or a plurality of wirings electrically connecting the heat source element to the main substrate, and each configured to transfer heat generated from the heat source element and the first transparent substrate, to the main substrate; a first special region preventing the heat generated from the heat source element and the first transparent substrate, from being transferred to the connector substrate; and a second special region providing a function of transferring the heat generated from the heat source element and the first transparent substrate.

What is claimed is: 
     
       1. An optical transmission module comprising:
 a first substrate having a first surface and a second surface; 
 a driving circuit disposed over the second surface of the first substrate; 
 one or more wirings disposed on and in contact with the second surface of the first substrate; 
 a metal layer disposed on the one or more wirings; 
 a heat conductive material disposed on the metal layer; 
 an optical element having a first surface and a second surface and including a light emitting element and a photo detector, the first surface of the optical element disposed over the heat conductive material, the metal layer, and the one or more wirings along a plane that is transverse to the first surface of the optical element, and the optical element is electrically connected to the driving circuit via the one or more wirings; 
 a second substrate having a first surface and a second surface; 
 a lens disposed on the first surface of the second substrate; 
 an optical connector configured to receive and optically couple an optical cable to the second substrate; and 
 a connection member that connects together the first surface of the second substrate and the second surface of the first substrate, 
 wherein the first surface of the second substrate is separated from the second surface of the optical element by a predetermined distance. 
 
     
     
       2. The optical transmission module of  claim 1 , wherein the second substrate and the lens are integrally molded. 
     
     
       3. The optical transmission module of  claim 1 , further comprising side walls that surround the optical element. 
     
     
       4. The optical transmission module of  claim 1 , wherein, in a cross-sectional view, a first width of the connection member near the first surface of the second substrate is smaller than a second width of the connection member near the second surface of the first substrate. 
     
     
       5. The optical transmission module of  claim 1 , wherein the connection member is a pin. 
     
     
       6. The optical transmission module of  claim 1 , wherein the connection member includes a resin and an adhesive. 
     
     
       7. The optical transmission module of  claim 1 , wherein the heat conductive material is a paste. 
     
     
       8. The optical transmission module of  claim 1 , wherein the heat conductive material is a metal. 
     
     
       9. The optical transmission module of  claim 1 , wherein the predetermined distance is in a special region. 
     
     
       10. The optical transmission module of  claim 1 , wherein the metal layer is a barrier metal layer. 
     
     
       11. The optical transmission module of  claim 1 , wherein the metal layer is a layer of nickel (Ni). 
     
     
       12. The optical transmission module of  claim 1 , wherein the first surface of the connection member is in contact with the second surface of the first substrate.